Aggregation of both biological and synthetic materials is a source of serious concern, posing problems at various stages of the discovery and formulation processes. Liposomes have been used in drug discovery and drug delivery for some time, and the biophysical characterization of these systems and their payloads is critical to understanding their function. One such payload is the membrane-associated receptor tyrosine kinase (RTK) targets which continue to be the focus of many discovery campaigns. RTKs are typically single-pass transmembrane signaling proteins which are difficult to purify intact, and are important targets in many disease pathways. Our aim is to correlate previously published activity data with the changes in size and aggregation state of the liposome-RTK complex as measured by Nanoparticle Tracking Analysis (NTA) by the NanoSight product range from Malvern Instruments.

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